Bob promises to join in the football match ________ he has to help his parents on the farm.
#57054
A
if
B
as
C
unless
D
when
推荐题目
He was just falling asleep _____ there was a loud knock on the door.
#56552
A
while
B
when
C
then
D
until
In summer milk will quickly go bad_____ it is put into a fridge.
#55322
A
though
B
unless
C
because
D
once